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The Project 'This Project's Name' Cannot Be Added to the Solution Because a Project With the Same Project Filename Already Exists in the Solution.

I recently updated to the newest version of unity and when trying to open scripts in Visual Studio it gives me the error "The Project 'This Project's Name' Cannot Be Added to the Solution Because a Project With the Same Project Filename Already Exists in the Solution." then it loads a solution with my current project's name that only has references and a folder called packages in it.

I have upgraded from 2017 to the new 2019 and I have the same problem. I tried to delete all the assembly and project files to let it to regenerate but it doesn't work. What it worst, it also opens both Visual studio 2017 and a very old Visual Studio 2012 express that is installed in my computer. :(